Adding a League to a Universe

[Dave1408]

I just want to confirm that what i've read is correct. I'm playing the MLB 09 Quickstart and am almost through my first season. I want to add a college and high school feeder system to my universe as well as maybe a Japanese League.
When is the best time during the year to add either of these?
Also, does anyone have any particular tips on adding either one of these types of leagues?
Any help is appreciated.

[Déjà Bru]

Dunno if this will help you; it's just a note that I wrote to myself a couple years ago but I think it still applies:

Adding Leagues

Always use an Add League button to do this task. Loading templates to an existing game may not necessarily work. It may look normal during set up, but the game will crash upon reloading.

This applies to adding a minor league or a feeder league. In that case, use the Add Minor League button.

When adding a league, make sure players have been generated and a schedule is in place. This may not have happened if the game was started already and you are adding a league after that; the new league will just be dormant in that case.

Also,

IMPORTANT: A feeder league cannot be constructed separately and added later to a template or started game; the affiliation to the major league does not work as intended and it functions as a minor league instead of a feeder league. Instead, a feeder league has to be added to the major league using the Add League button, and saved with the major league as part of the template or game. The ways to check whether this has been done properly are: 1. There will be an option in the major league game setup under Amateur Draft rules called Draft Feeding Mode for how the draft pool should be populated, feeder system only or feeder system + additional players, and 2. The feeder league will show the important age minimums and maximums under its roster rules, while an affiliated minor league does not show these settings.

As far as when, I think you can add leagues at any time but the usual best time for doing things like this IMO is offseason or preseason.